| /* |
| * Copyright 2016-present Open Networking Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.onosproject.artemis.impl; |
| |
| import com.google.common.collect.Sets; |
| import org.json.JSONArray; |
| import org.json.JSONException; |
| import org.json.JSONObject; |
| import org.onlab.packet.IpAddress; |
| import org.onlab.packet.IpPrefix; |
| import org.onosproject.artemis.impl.bgpspeakers.BgpSpeakers; |
| import org.onosproject.artemis.impl.bgpspeakers.QuaggaBgpSpeakers; |
| import org.onosproject.routing.bgp.BgpInfoService; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.ArrayList; |
| import java.util.Set; |
| |
| /** |
| * Timertask class which detects and mitigates BGP hijacks. |
| */ |
| class Deaggregator extends java.util.TimerTask { |
| |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| private Set<ArtemisConfig.ArtemisPrefixes> prefixes = Sets.newHashSet(); |
| private Set<BgpSpeakers> bgpSpeakers = Sets.newHashSet(); |
| |
| Deaggregator(BgpInfoService bgpInfoService) { |
| super(); |
| // deaggregator must know the type of the connected BGP speakers and the BGP info. |
| // for this example we only have one Quagga BGP speaker. |
| bgpSpeakers.add(new QuaggaBgpSpeakers(bgpInfoService)); |
| } |
| |
| @Override |
| public void run() { |
| ArrayList<JSONObject> messagesArray = DataHandler.getInstance().getData(); |
| // log.info("Messages size: " + messagesArray.size()); |
| |
| // Example of BGP Update message: |
| // { |
| // "path":[65001, 65002, 65004], (origin being last) |
| // "prefix":"12.0.0.0/8", |
| // } |
| |
| prefixes.forEach(prefix -> { |
| IpPrefix monitoredPrefix = prefix.prefix(); |
| |
| // for each update message in memory check for hijack |
| for (JSONObject tmp : messagesArray) { |
| IpPrefix receivedPrefix = null; |
| try { |
| receivedPrefix = IpPrefix.valueOf(tmp.getString("prefix")); |
| } catch (JSONException e) { |
| log.warn("JSONException: " + e.getMessage()); |
| e.printStackTrace(); |
| } |
| if (receivedPrefix == null) { |
| continue; |
| } |
| |
| // check if the announced network address is inside our subnet |
| if (monitoredPrefix.contains(receivedPrefix)) { |
| JSONArray path = null; |
| try { |
| path = tmp.getJSONArray("path"); |
| } catch (JSONException e) { |
| log.warn("JSONException: " + e.getMessage()); |
| e.printStackTrace(); |
| } |
| if (path == null) { |
| continue; |
| } |
| |
| int state = prefix.checkPath(path); |
| if (state >= 100) { |
| log.warn("BGP Hijack detected of type " + |
| (state - 100) + "\n" + tmp.toString()); |
| DataHandler.Serializer.writeHijack(tmp); |
| // can only de-aggregate /23 subnets and higher |
| int cidr = receivedPrefix.prefixLength(); |
| if (receivedPrefix.prefixLength() < 24) { |
| byte[] octets = receivedPrefix.address().toOctets(); |
| int byteGroup = (cidr + 1) / 8, |
| bitPos = 8 - (cidr + 1) % 8; |
| |
| octets[byteGroup] = (byte) (octets[byteGroup] & ~(1 << bitPos)); |
| String low = IpPrefix.valueOf(IpAddress.Version.INET, octets, cidr + 1).toString(); |
| octets[byteGroup] = (byte) (octets[byteGroup] | (1 << bitPos)); |
| String high = IpPrefix.valueOf(IpAddress.Version.INET, octets, cidr + 1).toString(); |
| |
| String[] prefixes = {low, high}; |
| bgpSpeakers.forEach(bgpSpeakers -> bgpSpeakers.announceSubPrefixes(prefixes)); |
| } else { |
| log.warn("Cannot announce smaller prefix than /24"); |
| } |
| } |
| } |
| } |
| }); |
| } |
| |
| public Set<ArtemisConfig.ArtemisPrefixes> getPrefixes() { |
| return prefixes; |
| } |
| |
| public void setPrefixes(Set<ArtemisConfig.ArtemisPrefixes> prefixes) { |
| this.prefixes = prefixes; |
| } |
| } |